Achromatin
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Achromatin is a term introduced by Flemming in 1874 to describe nuclear elements that do not stain with basic nuclear dyes. The article discusses how this classification has limitations, as some chromatin elements can appear achromatic at certain developmental stages, and some traditionally achromatic areas can give positive Feulgen reactions for chromatin.
Encyclopedia article (1928–1936)
ACHROMATIN (from the Greek a- negative particle, and chroma-color), a term introduced in 1874 by Flemming to designate those elements of the nucleus that are not chromatin, i.e., do not stain with basic, so-called nuclear dyes. This included all oxyphilic elements of the nucleus—lines or plates, nucleolar substance (nucleoli), so-called nuclear sap, and the membrane. However, at certain stages of their development, oxyphilic, i.e., "achromatic" in their relation to basic dyes, elements may also be known to be "chromatin" elements, such as chromosomes. On the other hand, in some cases, the achromatic areas of the nucleus in the former understanding of this word may give a positive Feulgen reaction for chromatin (see).
Figure 2. The objective represents a type of strong dry systems, characterized by a front lens in the form of a hemisphere, followed by two or three cemented double or triple lenses.
may also be known to be "chromatin" elements, such as chromosomes. On the other hand, in some cases, the achromatic areas of the nucleus in the former understanding of this word may give a positive Feulgen reaction for chromatin (see).
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“Achromatin.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/achromatin/